Effect of Chain Extension on Thermal Stability Behaviors of Polylactide Bioplastics

被引：16

作者：

Baimark, Yodthong ^{[1
]}

Cheerarot, Onanong

机构：

[1] Mahasarakham Univ, Fac Sci, Biodegradable Polymers Res Unit, Dept Chem, Maha Sarakham 44150, Thailand

来源：

ORIENTAL JOURNAL OF CHEMISTRY | 2015年 / 31卷 / 02期

关键词：

Biodegradable polymer; Chain extender; Melt flow index; Polylactide; Thermal stability;

D O I：

10.13005/ojc/310204

中图分类号：

Q5 [生物化学]; Q7 [分子生物学];

学科分类号：

071010 ; 081704 ;

摘要：

The influences of chain extension and blending temperature on the thermal properties of poly(L-lactide) (PLL) were investigated. Joncryl (R) ADR 4368, a styrene-acrylic multifunctional oligomeric agent, was used as a chain extender. Differential scanning calorimetry and thermogravimetry were used to determine the thermal transition properties and thermal stability of the chain extended PLL, respectively. The chain extension reaction occurred at a blending temperature of 190 degrees C better than at 170 degrees C. The molecular weights of the chain extended PLLs increased and melt flow indices decreased when the Joncryl (R) ADR 4368 ratio was increased. The addition of Joncryl (R) ADR 4368 had an effect on the glass transition temperature, crystallizing temperature and crystallinity of the PLL for the blending temperature of 190 degrees C. The chain extended PLLs with branched structures showed lower thermal stability than the linear PLLs. The content of branched PLLs increased with the Joncryl (R) ADR 4368 ratio and blending temperature. The chain extension reaction was complete when 2% Joncryl (R) ADR 4368 and a blending temperature of 190 degrees C were used. The results indicated that the chain extension improved the PLL's melt strength and it has an effect on the thermal stability of the PLLs.

引用

页码：635 / 641

页数：7

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